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A 54-year-old male school bus driver (the victim) died while installing tire chains on a 16-passenger minibus. While driving up a steep, icy hill, the driver was having difficulty controlling the minibus, which began slipping backward before reaching the top. The driver stopped the bus, put it in park, and engaged the emergency brake. He disembarked, walked to the back of the bus, and began installing tire chains. The bus began sliding backward and trapped him under the bumper. The bus then rotated clockwise 90 degrees and continued sliding down the hill into an embankment on the south edge of the roadway, crushing the victim between the bumper and the embankment. Several attempts to rescue the victim were unsuccessful. NIOSH researchers determined that to prevent similar occurrences, employers should: 1. ensure that bus drivers receive training for adverse weather and road conditions and follow proper procedures for tasks such as installing tire chains 2. consider equipping buses with studded tires for winter driving 3. ensure that bus drivers are aware of their right to cancel certain routes if adverse road/weather conditions do not permit safe travel.